Lorentz-violating vs. ghost gravitons: the example of Weyl gravity

N. Deruelle 1 M. Sasaki 2 Y. Sendouda 3 A. Youssef
1 APC - THEORIE
Institut für theoretische Physik, APC - UMR 7164 - AstroParticule et Cosmologie
Abstract : We show that the ghost degrees of freedom of Einstein gravity with a Weyl term can be tamed by a simple mechanism that invokes local Lorentz symmetry breaking. We demonstrate how the mechanism works in a cosmological setting. The presence of the Weyl term forces a redefinition of the quantum vacuum state of the tensor perturbations. As a consequence the amplitude of their spectrum blows up when the Lorentz-violating scale becomes comparable to the Hubble radius. Such a behaviour is in sharp contrast to what happens in standard Weyl gravity where the gravitational ghosts smoothly damp out the spectrum of primordial gravitational waves.
Type de document :
Article dans une revue
Journal of High Energy Physics, Springer, 2012, 09, pp.009. <10.1007/JHEP09(2012)009>


https://hal.archives-ouvertes.fr/hal-00740758
Contributeur : Alina Deniau <>
Soumis le : mercredi 10 octobre 2012 - 18:35:40
Dernière modification le : mardi 11 octobre 2016 - 13:27:24

Identifiants

Collections

OBSPM | CEA | APC | PSL | USPC

Citation

N. Deruelle, M. Sasaki, Y. Sendouda, A. Youssef. Lorentz-violating vs. ghost gravitons: the example of Weyl gravity. Journal of High Energy Physics, Springer, 2012, 09, pp.009. <10.1007/JHEP09(2012)009>. <hal-00740758>

Exporter

Partager

Métriques

Consultations de la notice

68